QSerialPort 5.2 and write function?

CroCo

I'm facing a problem with write function. Every time I send "Q" to Hyperterminal or putty, I receive "QQ". This is my code for this function.

@if ( choice == 1 ){
port->write("Q\r\n");

if ( port->waitForBytesWritten(-1) && port->clear() )
qDebug() << "Data has been send successfully...";
else
qDebug() << "Data hasn't been send successfully...";

}@

I've tested the code in Hyperterminal and putty, so I think the problem with Qt. I'm using Windows 7 and Qt 5,2. The compiler mingw32-make

CroCo

Never mind. The problem was HDD Virtual Serial Port. It has nothing to do with Qt or Hyperterminal

kuzulis

You are sure that problem is in "HDD Virtual Serial Port." ? Can you repeat your code in non-blocking manner (without call of waitForBytesWritten(())?

e.g.:

[code]
void YourClass::handleButtonClickedSlot()
{
port->write("Q\r\n");
}
[/code]

?

CroCo

I've tried this but I'm only able to send just one time after I can't send any more unless I use waitForBytesWritten(-1) or clear() . It seems that write() is in a blocking mode even though in the documentation "here":http://qt-project.org/doc/qt-5.1/qtserialport/blockingmaster.html it states that write() is in non blocking mode. I have no idea why this happens.